Tropicalrainforestsgrowinwarm,wetareas----CentralAmericaSouthAmereica,Arica,andSoutheastAsia.Becauseitrainsalotthere.Withsomuchrain,thesoilinrainforestsisverydarkandrichforplantstogrow.Morethanhalfofthetropicalplantsintheworldgrowinrainforest.Thousandsofanimalsliveinthem,too.

　　Rainforestsmakeuplessthan8%oftheearth,butmorethan50%oftheplantsandanimalsontheearthliveinthem.Thickplantsmakeitdifficulttogoveryfarintotheforest.Mostexploringmustbedoneonfoot,orbyboat.Therefore,therearelargeareasthathaven'tbeendiscovered

　　yet.

　　Tropicalrainforestsarerichforfood,medicineandotherusefulthings.

　　Today,sadly,rainforestsarethreatened(威胁)bysuchthingsasacidrainfromfactorysmokeemissions(散发)aroundtheworldandfromfarmexpansion(扩张).Alotofrainforestsareburnedorcutdowneachyear.Thelandisusedforfarmingofforbuildingfactories.Becauseofthelossofrainforests,1000kindsofplantsandanimalsbecomeextinct(灭绝).

　　Manypeopleunderstandtheimportanceofsavingtherainforests.Manycountriesaremakingrainforestsintonationalparks.Farmersarebeingtaughthowtogrowcropswithouthurtingtherainforests.

　　Perhapsyoucandosomethingtohelpprotecttherainforestsoftheearth.